. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . d be placed at some distance from the part being treated. As the current will not flow in one direction through the body(p. Ill), the direction of the current is of no importance. When theanode is central and the kathode peripheral we term the current a PLACE OF APPLICATION AND SIZE OF THE ELECTRODES 201 descending one. If the position of the poles is the opposite to thatjust mentioned, it is termed an ascending one. The sinusoidal being a true alternating current (page 77), the poleused need not b
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . d be placed at some distance from the part being treated. As the current will not flow in one direction through the body(p. Ill), the direction of the current is of no importance. When theanode is central and the kathode peripheral we term the current a PLACE OF APPLICATION AND SIZE OF THE ELECTRODES 201 descending one. If the position of the poles is the opposite to thatjust mentioned, it is termed an ascending one. The sinusoidal being a true alternating current (page 77), the poleused need not be considered. PLACE OF APPLICATION AND SIZE OF THE ELECTRODES If we wish to act directly upon a diseased part the electrodes shouldbe placed as near as possible to the seat of the disease; thus, if we aretreating a paralyzed muscle, the active electrode should be placed overthe motor point of that muscle, while the indifferent electrode may beplaced as near as possible to the nerve trunk supplying it (Fig. 154);if painful conditions of a nerve are being treated, the electrode should FxG. 154. Diagram showing position of electrodes for causing contraction of a muscle. The active electrodeshould be negative: a, active small electrode over motor point of vastus externus muscle; 6, indiffer-ent large electrode over anterior crural nerve. be placed as nearly as possible to where the nerve trunk is nearestthe surface (Plates I to VI). Jacoby^ speaks of an indirect method tobe used when it is not possible directly to influence the diseased method is based upon the observations of Head^ in reference to therelationship of the viscera to the nerve supply of definite cutaneous Electrotherapy, vol. ii, p. 136. ^ On Disturbances of Sensation, with Special Reference to the Pain of Visceral Disease, Brain, 1893,p. 1; 1894, p. 339; 1896, p. 153. 202 GENERAL RULES AND PRECAUTIONS areas. Reference to Figs. 155 and 15G and the table compiled byJacoby will illustrate these relations. Thu
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